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Fire Mustang (ファイアームスタング) is a 1991 shoot-'em-up for the Sega Mega Drive released exclusively in Japan, and a port of the 1990 arcade game USAAF Mustang. Both versions were developed by NMK; exactly how Taito got the license to a game originally published by the unrelated UPL is unknown.
You play as the pilot of a P-51 Mustang in World War II defeating both the German and Japanese naval air forces. shoots a single shot, while rapidfires; when you fire, you release both an "anti-air" shot straight ahead and drop an "anti-ground" bomb below. fires the "Forcer", a limited-use special weapon. Two types of powerups can improve the main shot (both types at once) or add to your Forcer stock, and there are rare extra life icons hidden somewhere in the game.
Like many NMK games, there are eight stages, and after beating them Mustang has you "loop" into a harder version of itself (only once?). Strangely, losing all lives forces you to continue, so a player needs to be fast about recording their score.